Pumping-jack for oil-wells.



No. 736,854. PATBNTED-APR. 11, 1905,

PUMPING JACK FOR OIL WELLS. APPLICATION FILED MAY 14, 1904.

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UNITED STATES Patented April 11, 1905.

PATENT OFFICE.

PUMPING-JACK FOR OIL-WELLS.

SPECIFICATION forming part of Letters Patent 1V0. 786,854, dated April11, 1905. Application filed May 14:, 1904. Serial No. 208,033.

To all whom it may concern.-

Be it known that I, HOLLAND Gr. STROTHER, a citizen of the UnitedStates. residing at Findlay, in the county of Hancock and State of Ohio,have invented a new and useful Pumping-Jack'for Oil-VVells, of which thefollowing is a specification.

This invention relates to pumping-jacks for oil-wells.

The objects of the invention are to improve, simplify, and strengthenthe construction, increase the efliciency in operation,.and reduce theexpense of manufacturing such devices.

With these objects in view the invention resides in the novelcombination and arrangement of parts and in the details of construe tionhereinafter described, with reference to the accompanying drawings,forming part of this specification, wherein Figure l is a side elevationof a pumpingjack constructed in accordance with the invention, and Fig.2 is a front elevation. I

The reference-numeral 1 indicates a suitable platform, which may bearranged above an oilwell in any suitable manner. Fastened upon theplatform 1, preferably by means of spikes 2, is a plurality of blocks 3,which are arranged in two sets, one on eachside of a polish-rod 4,passing through a suitable stuiiingbox 5 in the platform 1. Extendingthrough each of the two sets of blocks 3 is a rod 6, havingsuitablecross-pins therein to prevent withdrawal. Mounted upon the outer end ofeach pin 6 is an upright 7, which is steadied and strengthened by abrace 8, fitted into a block 9, attached to the platform 1. Above thebraces 8 suitable shoulders or abutments 10 are attached to each upright7 by means of a bolt 11. Above the shoulders 10 the uprights 7 7 areconnected by a cross-piece 12,

which is formed at each end with integral projecting arms 13, fittingagainst the opposite sides of the uprights 7 and connected at theirouter ends by hinged links 14, engaging staples 15 and being heldthereon by The polish-rod 4 passes through the cross-piece 12 and ismade to move therewith by means of a divided adjustable collar 17, thesections of which are clamped together by bolts 18. It will be apparentthat the cross-piece 12 is adapted to reciprocate vertically upon theuprights 7 and impart its reciprocation to the polish-rod 4. Should theoperating mechanism hereinafter to be described become deranged at anytime, the fall of the cross-piece will be stopped by the shoulders thelevers 21 is pivoted, by means of a rod 22,

to the upper end of ashort lever 23, that is pivotally mounted at itslower end upon the rod 6 in the blocks 3. The lower end of each lever 21is connected, by means of a rod 24, to a draw rod or rein 25, which isoperated by any suitable engine or the like. It will be observed thatthe rods 22 and 24 connect the levers 21 21 and cause them to operatetogether.

The operation of the improved pumpingjack will be apparent from theillustration, and further description thereof is thought to beunnecessary.

By pivotally mounting the operating-levers 21 intermediate their endsany lateral strain upon the cross-piece 12 and polish-rod 4 isprevented, and said polish-rod is caused to reciprocate easily andsmoothly in a vertical direction, thus preventing wear upon either therod or the packing in the stuffing-box and requiring only the minimum ofpower to operate the jack.

The device of the invention is strong, simple and inexpensive inconstruction, and thoroughly satisfactory in operation; Inits novelcombination and arrangement of parts and in its details of constructionit presents a decided improvement over prior devices of a similarcharacter. 7

Changes in the precise embodiment of inventionillustrated and describedmay be made within the scope of the following claim without departingfrom the spirit of the invention.

Having thus described the invention, what is claimed is I In adevice ofthe class described, a base having a plurality of spaced blocks disposedin two sets in alinement with each other, uprights mounted between andextending upwardly from the outer blocks, inclined braces for saiduprights, abutments secured upon the latter, a cross-head engaging theuprights and moving vertically upon the latter, spaced blocks arrangedin pairs upon the under side of said cross-head, operating-leverspivotally connected with said blocks, auxiliary levers connected withthe operating-levers intermediate the ends of the latter by means oftransverse 5 rods, pivotal connecting means between the lower ends ofsaid auxiliary levers and the base-blocks, operating-bars, and atransverse rod connecting the latter with the free ends of theoperating-levers.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in the presence of two witnesses.

ROLLAND Gr. STROTHER.

IVitnesses:

E. T. DUNN, MAUDE M. BOEIIMER.

